<pre><code>here is some code
</code></pre>

<p>That's using the <em>fenced-code-blocks</em> extra.</p>

<p>Here is an empty one (just to check):</p>

<pre><code>
</code></pre>

<p>Here is one at the end of the file:</p>

<pre><code>    is indentation maintained?
</code></pre>
